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New CO2 Laser 25mm Si Full Reflection Lens Mirror |  |
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US $55.00 | 26d 22h 51m |
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CO2 Laser reflection lens mirror housing fixture Mount | |
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US $21.95 | 21d 5h 27m |
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40W~80W CO2 Laser 25mm Si Full Reflection Lens Mirror | |
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US $55.00 | 15d 4h 31m |
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Reflection Reflector Mirror Lens ags RGB 400nm~700nm Visible Laser 25*12mm | |
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US $9.50 | 25d 5h 39m |
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Reflection Reflector Mirror Lens ags RGB 400~700nm Visible Laser 35*12mm | |
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US $14.59 | 11d 9h 20m |
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Reflection Lens ags RGB 400~700nm Visible Laser 50*60mm | |
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US $22.89 | 11d 7h 50m |
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Laser Reflection Lens
For distance sensors using optical triangulation and lasers, is spectal or diffuse reflection used?
Do most of these types of sensors use diffuse reflection? Otherwise the sensor would not be able to detect the distance to a surface orthogonal to the laser beam and a huge CCD sensor would be required.
Does anyone know of such sensors that do operate on the principal of specular reflection? I can see using many simple photo receptors instead of a CCD but I would expect a pulse-type sensor to be more accurate, smaller, and less expensive.
If they do use diffuse reflection, how does the sensor determine position based on it? Most of the drawings explaining how optical triangulation works show a single ray of light, not the multiple rays that would exist when looking at the diffused reflection! There would be multiple rays entering the lens at different angles. Does anyone know how this works?!
David,
I'm not an optics speciallist, so I don't know the answer to your question. However, I'd like to invite your question to a group dedicated to sensors: http://tech.groups.yahoo.com/group/sensorforum
- Nick
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New CO2 Laser 25mm Si Full Reflection Lens Mirror | |
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US $55.00 | 26d 22h 51m |
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CO2 Laser reflection lens mirror housing fixture Mount | |
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US $21.95 | 21d 5h 27m |
|
40W~80W CO2 Laser 25mm Si Full Reflection Lens Mirror | |
|
US $55.00 | 15d 4h 31m |
|
Reflection Reflector Mirror Lens ags RGB 400nm~700nm Visible Laser 25*12mm | |
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US $9.50 | 25d 5h 39m |
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Reflection Reflector Mirror Lens ags RGB 400~700nm Visible Laser 35*12mm | |
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US $14.59 | 11d 9h 20m |
|
Reflection Lens ags RGB 400~700nm Visible Laser 50*60mm | |
|
US $22.89 | 11d 7h 50m |
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No items matching your keywords were found.
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No items matching your keywords were found.
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New CO2 Laser 25mm Si Full Reflection Lens Mirror | |
|
US $55.00 | 26d 22h 51m |
|
CO2 Laser reflection lens mirror housing fixture Mount | |
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US $21.95 | 21d 5h 27m |
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Reflection Reflective Film/Lens for 405nm-445nm-532nm-635nm-650nm Laser | |
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US $9.96 | 25d 4h 24m |
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3 Reflection Mirror 20mm+ 1HQ Znse Focus Lens 12mm FL50.8 for CO2 Laser Engraver | |
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US $90.00 | 21d 6h 47m |
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40W~80W CO2 Laser 25mm Si Full Reflection Lens Mirror | |
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US $55.00 | 15d 4h 31m |
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50*60mm Reflection Lens ags RGB 400~700nm Visible Laser | |
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US $20.40 | 2d 12h 9m |
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Reflection Reflective Film/Lens for 400~700nm Blue Green Red Visible Laser RGB | |
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US $13.96 | 2d 10h 40m |
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Reflection Reflector Mirror Lens ags RGB 400nm~700nm Visible Laser 25*12mm | |
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US $9.50 | 25d 5h 39m |
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Reflection Reflector Mirror Lens ags RGB 400~700nm Visible Laser 35*12mm | |
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US $14.59 | 11d 9h 20m |
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Reflection Lens ags RGB 400~700nm Visible Laser 50*60mm | |
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US $22.89 | 11d 7h 50m |
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LASER LENS CLEANER FOR DVD $12.99 LASER LENS CLEANER FOR DVD |
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Reflection $9.49 Reflection |
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Reflection Certificate $24.99 Reflection Certificate Awards: Celebrate excellence with this stunning motivational certificate award featuring the motivational image of an epic reflection from the Successories Certificate Paper Collection. Easily personalized with your laser or inkjet printer, the spectacular Successories Reflection Certificate Award is the perfect way to recognize and motivate any member of your team. This easy-to-create award certificate is perfect for instant recognition. Paper is premium 100 lb white paper. Certificates come in 100 sheets per pack. Full Color Stunning Image Superior quality 100 lb certificate paper Laser and inkjet compatible Product Information Material: 100 lb Bright White Paper Quantity: 100 Sheets Per Pack Dimensions: 8.5" x 11" |
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GE 72598 LASER LENS CLEANER $19.99 GE 72598 LASER LENS CLEANER |
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CLEAN DR. LASER LENS CLEANER $18.99 CLEAN DR. LASER LENS CLEANER |
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CleanDr Computers Laser Lens Cleaner $39.48 CLEANDR. LASER LENS CLEANER ACCSCOMPUTERS |
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internal reflections of 408nm and 532 nm laser beams in projection TV lens
New Years Eve Reflections
On July 20th 1969 I was a second year medical student sitting alone in a cottage in the English countryside. It was the early hours of the morning, but it was also a moment when the world radically changed. Neil Armstrong stepped onto the surface of the moon and said: "One small step for man, one giant leap for mankind".
At this particular point in our lives, not just at the end of one year and the beginning of another; but at a time of economic fear and talks of recessions and depressions, it’s good to remember what great things, we as humans are really capable of. It’s almost 40 years ago now, that those astonishing pictures of our beautiful, blue earth, taken from the surface of the moon against a background of pitch black space, made us realise that literally, we’re all in this together, and we all have a part to play.
Back here on earth at the end of 2008 and the beginning of 2009, the talk in the media is all about global financial meltdowns with all its consequences. However, from a medical point of view, things are humming along quite nicely thank you very much. Since man landed on the moon we’ve made great strides in medicine too. For instance, we now have fantastic scanning machines to look inside the human body without having to slice it open. Our understanding and management of cardiovascular disease is very advanced, as a result of which hundreds of thousands of lives have been saved. Sight has been restored with lens implants and laser treatments. Hearing has been restored to the profoundly deaf through cochlear implants. More recently, the advances in cancer treatment have taken a leap forward with the introduction of vaccines to prevent cervical cancer, a common killer of younger women. Childhood leukaemia isn’t the death sentence it once used to be, thanks to tremendous results achieved using novel medications and the gift of bone marrow transplants. The list of advances is really impressive, but needless to say, there is still a vast amount of work to do.
Whilst the scientists have been doing a great job, we as individuals still need to do more in our own lives. Why is obesity on the rise? Why so much type II diabetes? Why hasn’t smoking gone the way of the Dodo, and why are so many of our indigenous brothers and sisters still living in third world conditions? Lives are still needlessly lost to drink driving, suicide and lifestyle related cancers. Our beaches are still full at this time of the year in the middle of the day, as people chase beauty by burning, ignoring the fact that they increase their risk of sun induced skin cancers.
We are lucky people living in a smart country, but we could do a whole lot better. Perhaps we could turn the coming economic belt tightening to our own good use: by becoming fitter and healthier; by losing weight where appropriate and eating more fresh veggies and fruit; by stopping smoking and cutting down alcohol intake; by not being sucked in by quick fix, “you too can look as beautiful or as rich as me” advertising. Then perhaps we can be a bit more confident in who we are.
Perhaps we can reach out to those who need that extra bit of care and attention. Perhaps by living a healthy life we can reduce our reliance on the health system so that less is needed to treat life-style related health problems, and more can be spent on treating sick kids and those in real need. Perhaps by each one of us taking responsibility for living our own lives as well as we can, then we can really say that we are smart people living in a very lucky country.
Wishing you a very happy healthy and hope-filled New Year.
About the Author
HBF Health Funds, the largest health insurance provider in Western Australia.
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